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Transcript
LABEL THE HEART • At the end of the lesson you should be able to identify: • NAMES OF LAYERS • CHAMBERS • VALVES • MAJOR BLOOD VESSELS CARDIOVASCULAR SYSTEM • ALSO KNOW AS CIRCULATORY SYSTEM CV SYSTEM • HEART • BLOOD VESSELS • BLOOD TRANSPORTATION SYSTEM • TRANSPORTS – – – – OXYGEN NUTRIENTS TO BODY CELLS CARBON DIOXIDE METABOLIC MATERIALS AWAY FROM BODY CELLS HEART • • • • MUSCULAR, HOLLOW ORGAN PUMP OF THE BODY SIZE OF CLOSED FIST LOCATED – – – – MEDIASTINAL CAVITY BETWEEN LUNGS BEHIND STERNUM ABOVE DIAPHRAGM THREE LAYERS OF TISSUE • ENDOCARDIUM • MYOCARDIUM • PERICARDIUM ENDOCARDIUM • SMOOTH LAYER OF CELLS • LINES THE INSIDE OF THE HEART & BLOOD VESSELS • ALLOWS FOR SMOOTH FLOW OF BLOOD MYOCARDIUM • Thickest layer • muscular middle layer PERICARDIUM • DOUBLE LAYERED MEMBRANE OR SAC • COVERS THE OUTSIDE OF THE HEART SEPTUM • MUSCULAR WALL • SEPARATES HEART INTO RIGHT AND LEFT SIDE • PREVENTS BLOOD FROM MOVING BETWEEN THE RIGHT AND LEFT SIDE OF THE HEART • UPPER PART OF SEPTUM CALLED – INTERATRIAL SEPTUM • LOWER PART CALLED – INTERVENTRICULAR SEPTUM HEART CHAMBERS • FOUR PARTS OR CHAMBERS • TWO UPPER CHAMBERS – ATRIA • TWO LOWER CHAMBERS – VENTRICLES VALVES • TRICUSPID VALVE – RIGHT ATRIUM & RIGHT VENTRICLE • PULMONARY VALVE – RIGHT VENTRICLE AND PULMONARY ARTERY MITRAL VALVE • BETWEEN LEFT ATRIUM AND LEFT VENTRICLE AORTIC VALVE • BETWEEN LEFT VENTRICLE AND AORTA HEART BEAT CYCLE • RIGHT & LEFT SIDES OF HEART WORK TOGETHER • ELECTRICAL IMPULSE CAUSES MYOCARDIUM TO CONTRACT • PERIOD OF CONTRACTION OR (SYSTOLE) FOLLOWED BY A BRIEF PERIOD OF REST (DIASTOLE) RIGHT ARTIUM • RECEIVES BLOOD – AS RETURNS FROM BODY CELLS RIGHT VENTRICLE • RECEIVES BLOOD – FROM RIGHT ATRIUM – PUSHES BLOOD • INTO PULMONARY ARTERY WHICH CARRIES BLOOD TO LUNGS FOR OXYGEN LEFT ATRIUM • RECEIVES OXYGENATED BLOOD FROM LUNGS LEFT VENTRICLE • RECEIVES BLOOD FROM THE LEFT ATRIUM • PUSHES BLOOD INTO THE AORTA VALVES • ONE WAY VALVES IN CHAMBERS OF HEART KEEP BLOOD FLOWING RIGHT DIRECTION – – – – TRICUSPID PULMONARY MITRAL AORTIC CONDUCTIVE PATHWAY • Electrical impulses starting in the heart cause contraction of the muscles. Sinoatrial node (SA) • Group of nerves located in right atrium • Pacemaker • Sends electrical impulse that spreads over muscle of atria • Atrial muscles contract then push blood into ventricles. • After impulse goes through atria reaches the Atrioventricular (AV) node. Atrioventricular (AV) node • • • • Group of nerve cells Located between the atria and ventricles Electrical impulse through septum Nerve fibres in septum called bundle of HIS Bundle of HIS • Nerve fibres in septum • Right and left bundle branches Right and left bundle branches • Carry impulse down through ventricles • Subdivide into a network of nerve fibres in ventricle called purkinje fibres. Purkinje fibres • Final conduction pathway • Spread to all muscle tissue in the ventricles • Ventricles contract Conduction • Occurs approximately every 0.8 seconds. • Electrical impulse can be recorded on an EKG • Used to detect abnormal activity or disease. THE END